python3.5.2 从文件中删除所有匹配的字符

Question

给定以下示例，我如何从具有以下内容的文件中删除所有“a”字符:

asdasdasd \n d1233sss \n aaa \n 123

我编写了以下解决方案，但它不起作用:

with open("testfisier","r+") as file:
    for line in file:
        for index in range(len(line)):
            if line[index] is "a":line[index].replace("a","")

Answer 1

没有任何更改，因为您没有将其写回文件。

with open("testfisier", "r+") as file:
    for line in file:
        for index in range(len(line)):
            if line[index] is "a":
                replace_file = line[index].replace("a", "")

    # Write the changes.
    file.write(replace_file)

或者:

with open("testfisier", "r+") as f:
    f.write(f.read().replace("a", ""))